RFK Jr.'s Vaccine Crusade: HHS Revolt, MAHA Rise, & Trump Twist

Robert F. Kennedy Jr. BioSnap a weekly updated Biography. Robert F. Kennedy Jr. is back in the spotlight this week after demanding the retraction of a major Danish vaccine safety study published in the Annals of Internal Medicine, which found no link between aluminum in vaccines and childhood diseases. According to Nature, he is pushing aggressively against the study’s conclusions, arguing the methods were flawed, particularly for excluding young children who died before age two and not fully comparing vaccinated and unvaccinated cohorts. This unusual move for a U.S. public official—especially a sitting Health and Human Services Secretary—has experts talking about Kennedy’s willingness to bend scientific discourse to his will, with the study’s authors and public health commentators quick to defend its conclusions and highlight that claims about vaccines causing autism have been repeatedly debunked. The controversy is feeding a wave of internal strife. ABC News reports that more than 750 HHS employees sent a letter to Kennedy and Congress, urgently asking him to stop spreading vaccine misinformation. There’s open unrest at HHS, with staffers accusing their boss of undermining public health from the inside. Politico says the letter came in the wake of a deadly shooting at the Centers for Disease Control and Prevention’s campus, for which some CDC employees have also expressed frustration with federal leaders, including Kennedy, for fueling vaccine skepticism and providing little public reassurance in the aftermath. Externally, Kennedy continues to organize and grow his Make America Healthy Again movement, or MAHA, despite facing mounting criticism and claims he’s “veering out of control,” as Stat reports in a recent headline. According to Axios, Kennedy and his allies are working overtime to rally MAHA supporters as a crucial constituency for the 2026 midterms, with a focus on public appearances in battleground states including Texas and North Carolina, and a new “MAHA in Action” website detailing his tour schedule. There’s an aggressive ad blitz underway, with millions spent on TV, billboards, and public transit, spotlighting his battles against synthetic food dyes and additives. But even his base is rumbling: some MAHA activists are furious the Trump administration isn’t following through on tougher restrictions on pesticides, a core Kennedy crusade. Adding another twist, Wikipedia notes an abrupt political turn—Kennedy filed to be removed from the Arizona ballot and then promptly endorsed Donald Trump, backpedaling from prior statements that he would never join forces with Trump. In his endorsement, Kennedy asserted he’d found “alignment on many key issues” after direct talks with the former president. Social media is abuzz, with critics and supporters dissecting his pivot, and there’s no shortage of memes mocking how quickly he reversed his public rhetoric. In sum, Robert F. Kennedy Jr. is dominating both political and scientific news, sti